<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title></title>
</head>
<body>
	<script>
		var browserType = 'mozilla';
		browserType.lenght;
		// indexOf字符串搜索,没有的话返回-1;
		/*
		slice()提取已知位置的字符串.
		 */
	</script>
</body>
</html>